Midterm
1. A group of eagles living around Lake Tahoe would be considered a(n) .
A. abiotic factor B. population C. community D. ecosystem
2. What is one biotic factor that affects the size of a population in an ecosystem?
A. Local geography B. Number of predators present
C. Average yearly temperature D. Average yearly precipitation
3. Organisms, such as plants or phytoplankton that carry out photosynthesis, would
cause a decrease of which gas in the atmosphere?
A. Oxygen B. Carbon dioxide C. Water D. Ozone
4.
is
A.
C.
In the carbon cycle, decomposers return carbon to the soil. Which of the following
NOT something that decomposers can break down?
Waste products like urine or feces B. The bodies of dead plants and animals.
Carbon dioxide found in the air D. Scraps of discarded food
5. Humans increase carbon dioxide (CO2) in the atmosphere, and contribute to the
carbon cycle by
A. combustion from driving cars.
B. planting trees to improve photosynthesis.
C. conserving energy with alternative energies.
D. using more solar power electricity.
6. Nitrogen in the air must be "fixed" before it can be used by plants. Atmospheric
nitrogen is "fixed" by
A. plants. B. bacteria and insects.
C. bacteria D. bacteria and fungi (decomposers).
7. The main result of photosynthesis is
A. decreased atmospheric nitrogen. B. CO2 is removed and captured by plants.
C. absorbing nitrogen for the plant to use. D. global warming caused by CO2 being
removed.
14. What are the names for the parts of the water cycle labeled above?
A)_________________________
B)_________________________
C)_________________________
E)_________________________
F)_________________________
15. Conditions in the environment that impact the size of the population are called
A. limiting factors. B. populations. C. habitats. D. niches.
16. Which factor is a density-dependent limiting factor on the population of a
species?
A. Predation B. Unusual weather C. Natural disasters D. Seasonal variation
8. Based on the chart to the right, which of these events would
have the biggest immediate impact on the Georgia Black
Bear population?
A. large scale forest fires
B. damming lakes and rivers
C. introduction of the bald eagle
D. restriction on humans hunting bears
9. In the food web to the right, the
insectivorous birds would be classified as
A. carnivores.
B. decomposers.
C. herbivores.
D. omnivores.
10. In the food web to the right, what
would be a direct impact of an
increase in the amount of toads in the
ecosystem?
A. an increase in the population of
squirrels
B. a decrease in the population of owls
C. an increase in the population of snakes
D. a decrease in the rabbit population
11. Organisms that use energy from the sun
to make their own food are called
A. detritivores. B. consumers. C. omnivores. D.
producers.
12. The figure to the right shows a trophic
pyramid for an ecosystem. What
happens to the amount of energy in the pyramid
as it moves up through the
different levels?
A. Energy increases by 10% each level
B. Energy decreases by 90% each level
C. Energy decreases by 10% each level
D. Energy increases by 90% each level
13. The purpose of photosynthesis is to
A. make ATP for humans. B. build proteins in plants.
C. store solar energy as sugar. D. A and C
17. In which organelle does photosynthesis occur?
A. Mitochondria B. Chloroplast C. Lysosome D. Nucleus
18. During photosynthesis, different gases move in and out of plant cells. Which
phrase best represents the net flow of gases involved in photosynthesis?
A. Carbon dioxide moves in; oxygen moves out B. Oxygen moves in; carbon dioxide moves
out
C. Carbon dioxide moves in; nitrogen moves out D. Oxygen moves in; nitrogen moves out
19. Energy from food must be transformed into the bonds of _________ before it can be
used by cells.
A. ATP B. FADH2 C. NADP D. sugar
Short Answer:
20. What is a Keystone Species?
21. What would happen if a keystone species was removed from an ecosystem?
22. What is the source of all energy that is in the natural world (ecosystems, animals, etc)?
Create an energy pyramid and label the following terms:
Primary producer, Primary Consumer, Secondary Consumer, Tertiary Consumer, Quaternary Consumer
Pick one:
In the Nitrogen cycle, how is Nitrogen in the atmosphere turned into usable Nitrogen for plants?
What happens when large amounts of Nitrogen end up in bodies of water and are carried into oceans?